I think there can be a bit of a difference, though heavy drinking can lead to addiction especially if its in genetics like family members have alcoholism. I myself have had issues with drinking but I wouldn't call it an addiction since I do actually have the control not to and I've never really had withdrawls....my problems have more been drinking when I am upset in excess, and past attempts at self medication. I mean I think with addiction you would have the experience of 'needing' to have a drink, rather then where I know I probably shouldn't drink on a certain occasion or know I should pace myself and end up doing it anyways even though I could choose not to. Of course it can be confusing, at time s I have wondered if I've gotten addicted or came close but I don't think I'd legitimately fit the criteria.